/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package vn.hva.bluepumpkin.server.servlets;

import java.io.IOException;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.naming.NamingException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import vn.hva.bluepumpkin.Constants;
import vn.hva.bluepumpkin.common.dto.UserDTO;
import vn.hva.bluepumpkin.common.util.ServiceLocator;
import vn.hva.bluepumpkin.ejb.session.user.UserFacadeRemote;
import vn.hva.bluepumpkin.ejb.session.user.UserFacadeRemoteHome;

/**
 *
 * @author Leung
 */
public class LoginServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        // validate
        boolean flag = false;
        if (username == null && username.trim().length() < Constants.MIN_LENGTH) {
            request.setAttribute("login.err_username", "User name is required.");
            flag = true;
        } else if (password == null && password.trim().length() < Constants.MIN_LENGTH) {
            request.setAttribute("login.err_password", "Password is required.");
            flag = true;
        }
        // check authenticate
        UserDTO user = null;
        if (!flag) {
            // check authenticate
            try {
                UserFacadeRemoteHome remoteHome = (UserFacadeRemoteHome) ServiceLocator.getEjbRemoteHome("java:UserFacade", UserFacadeRemoteHome.class);
                UserFacadeRemote remote = remoteHome.create();
                user = remote.login(username, password);
                
            } catch (CreateException ex) {
                ex.printStackTrace();
            } catch (RemoteException ex) {
                ex.printStackTrace();
            } catch (NamingException ex) {
                ex.printStackTrace();
            }
            if (user != null) {
                // login successful
                // Create a session
                HttpSession session = request.getSession(true);
                session.setAttribute("user", user);
                // checking role for redirect
                response.sendRedirect(Constants.EMPLOYEE_URL + "home.jsp");
                
                return;
            }
        }
        // login failed
        request.setAttribute("error", "yes");
        RequestDispatcher rd = request.getRequestDispatcher("/pages/employee/login.jsp");
        rd.forward(request, response);

    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
